package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段数据填充");
        //1.获取目标方法上的注解，并拿到注解里的属性值
        MethodSignature methodSignature =(MethodSignature) joinPoint.getSignature();//获取方法签名
        Method method = methodSignature.getMethod();//获取方法
        AutoFill autoFill = method.getAnnotation(AutoFill.class);//获取方法上的注解
        OperationType operationType = autoFill.value();//拿到注解里的属性值

        //2.获取目标方法的参数对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0]; //拿到实体对象


        //3.判断注解中的属性值，如果是INSERT，就补充四个字段（创建时间，修改时间，创建人，修改人）
        try {
            if(operationType == OperationType.INSERT){
                //通过反射补充属性值
                Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreatUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreatTime.invoke(entity, LocalDateTime.now());
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setCreatUser.invoke(entity, BaseContext.getCurrentId());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
        //3.判断注解中的属性值，如果是INSERT，就补充两个个字段（修改时间，修改人）
            } else if (operationType == OperationType.UPDATE) {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());

            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }

}
